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PMH31 ASSOCIATION BETWEEN CHOICE OF ANTIPSYCHOTIC TREATMENT AND SUBSEQUENT COSTS OF MEDICAL CARE IN PATIENTS WITH BIPOLAR DISORDER
A178 practice in central Massachusetts were used to identify 1777 patients age q65 years as of January 1, 2006 with continuous medical and pharmacy coverage in 2005 (baseline) and 2006 (study period) and q1 depression diagnosis in 2005. Patients with q1 antidepressant claim in 2006 were classified as “treated” and those without an antidepressant as “untreated.” Depressed patients were randomly matched to controls without depression on age and gender. Baseline comorbidity profiles were compared using Chi-square tests. Wilcoxon rank-sum tests and generalized linear models were used to compare study period direct (medical and pharmacy) costs defined as third party payments to providers. Depression-related costs were identified using claims with depression diagnosis and antidepressant prescriptions. RESULTS: A total of 1334 (75.1%) of depressed patients were treated with antidepressants during the study period and 443 patients (24.9%) were not treated. Depressed patients were on average 77 years old and 74.8% were women. Depressed patients had higher rates of mental health and physical comorbidities than controls. Treated depressed patients had higher rates of mental health comorbidities than the untreated but few differences in rates of physical comorbidities. During the study period average annual direct costs were $14,362 among treated depressed patients, $8,928 among the untreated, and $6,961 among controls (P 0.01 for all comparisons). Risk-adjusted direct costs were significantly different between the treated and untreated depressed. Average depression-related costs were $1,582 among the treated and $133 among the untreated (P 0.01). CONCLUSIONS: Older depressed patients (both treated and untreated) had more comorbidities and higher costs compared to controls. Costs and rates of mental health comorbidities were higher among the treated depressed compared with the untreated. PMH30 HOSPITALIZATION COSTS FOR SCHIZOPHRENIA RELAPSES IN A PUBLIC PSYCHIATRIC INSTITUTION Verduzco W1, Escobedo O2, Anaya P3 1 Mexican Social Security Institute, Mexico City, Mexico, 2Mexican Social Security Institute, Mexico City, D.F, Mexico, 3AstraZeneca, Naucalpan, Edo. de Méx, Mexico OBJECTIVES: To estimate hospitalization costs as well as resources used by schizophrenic patients during a relapse in a public psychiatric hospital. METHODS: A documental retrospective analysis of schizophrenia patients with a relapse as the principal diagnosis was carried out in a public psychiatric hospital in Mexico. The range of patients’ age was from 18 to 64 years. Data was collected by a General Physician through a Case Report Form designed specifically for this study. Resources used during relapse hospitalization were accrued and final costs were calculated using unitary costs of the Mexican Social Security Institute (IMSS) for laboratory studies, physician’s visit, emergency admittance and bed day. Drug costs were obtained from public bids of the same institution. Results are presented using descriptive statistics. Costs are in US dollars using and exchange rate of 13.5 MXN pesos for 1 US dollar. RESULTS: Sample size was of 73 patients with an average follow up of 3.3 years. Hospital average length of stay was 20.65 days (4–108), average time between relapses was 14.66 months (6.47–25.73). The average cost per day was $346 (95% IC, $331–$360), 96% of this cost represents the average bed day cost reported by the IMSS. The average cost per relapse was $7,086 ($1,498–$36,288). Alcoholism and hypertension were the main comorbidities reported in 10.8% of admitted patients. Lack of compliance was the reason for relapse in 95% of the cases. CONCLUSIONS: Bed day cost is the main component of total costs, therefore it would make sense to use those antipsychotic drugs that help reduce the hospital length of stay. The lack of compliance is responsible for the vast majority of relapses (95%). A health care program focus in increasing drug compliance could decrease institutional general costs by reducing hospitalizations due to relapses. PMH31 ASSOCIATION BETWEEN CHOICE OF ANTIPSYCHOTIC TREATMENT AND SUBSEQUENT COSTS OF MEDICAL CARE IN PATIENTS WITH BIPOLAR DISORDER Mychaskiw y MA1, Sanders KN1, Alvir J1, Montejano LB2, Lenhart G3, O’Gorman C1 1 Pfizer, New York, NY, USA, 2Thomson Reuters, Washington, DC, USA, 3Thomson Reuters, Cambridge, MA, USA OBJECTIVES: Efficacy in bipolar disorder (BPD) has been demonstrated for various atypical antipsychotics (APs). Treatment choice is based on factors including patient history and clinician preference. Because cost of patient care is often a factor, this study explored the association between AP treatment choice and subsequent medical care costs. METHODS: Patients with BPD and AP treatment were identified in the 2004–2005 PharMetrics Patient-Centric Database. Patients were stratified by the most-recently prescribed AP and retained with q12 months continuous enrollment before and after their earliest AP claim. Total medical care costs were tallied from all paid claims for 12 months post AP initiation. Multivariable analyses controlled for differences between cohorts. RESULTS: AP patient cohorts were ziprasidone (n 825), olanzapine (n 2526), risperidone (n 2309), quetiapine (n 2860) and aripiprazole (n 1187). Mean age was 39–42 years. Ziprasidone patients were more likely to be female. Approximately 25% of the sample had comorbid anxiety and 10% had alcohol abuse. The majority had concomitant medication use. After controlling for covariates, the ziprasidone group’s 12-month post-initiation total costs ($14,445) were similar to risperidone ($13,358, p .06) and olanzapine ($13,780, p 0.24), and, lower than quetiapine ($15,740, p 0.03) and aripiprazole ($16,360, p 0.01). Older age, female gender, pre-index psychiatric admission, comorbidities, and concomitant medication were significantly associated with increased costs. Nevertheless, unadjusted results were similar to multivariable findings. CONCLUSIONS: Twelve months fol-
Abstracts lowing treatment initiation for BPD, total medical care costs for patients on ziprasidone were comparable to those for patients on olanzapine or risperidone, and, significantly lower than costs for patients on quetiapine or aripiprazole. If cost is a factor in AP treatment choice, the findings suggest ziprasidone compares favorably. PMH32 ANTIPSYCHOTIC TREATMENT CHOICE AND ASSOCIATED COSTS OF MEDICAL CARE IN PATIENTS WITH SCHIZOPHRENIA Sanders KN1, Mychaskiw MA1, Alvir J1, Lenhart G2, Palmer L3, O’Gorman C1 1 Pfizer, New York, NY, USA, 2Thomson Medstat, Cambridge, MA, USA, 3Thomson Reuters, Ann Arbor, MI, USA OBJECTIVES: Efficacy in treating schizophrenia has been demonstrated for a variety of atypical antipsychotics (APs). Clinicians will select an appropriate AP based on a variety of clinical considerations but cost of patient care is increasingly becoming a consideration. This study explored the association between AP treatment choice and subsequent medical care costs. METHODS: Patients with schizophrenia and AP treatment were identified in the 2004–2005 PharMetrics Patient-Centric Database. Patients were stratified by the most-recently prescribed AP and retained with q12 months continuous enrollment before and after their earliest AP claim. Total and psychiatricrelated medical care costs were tallied from all paid claims for 12 months post AP initiation. Multivariable analyses controlled for differences between cohorts. RESULTS: Patient cohorts were ziprasidone (n 207), olanzapine (n 755), risperidone (n 1004), quetiapine (n 404) and aripiprazole (n 367). Mean age was 40–44 years. Mood disorders, anxiety, alcohol abuse and substance abuse were prevalent among the sample. Most patients had concomitant medication use. After controlling for covariates, the ziprasidone group’s 12-month post-initiation total costs ($12,920) were similar to risperidone ($11,522, p 0.14), olanzapine ($13,398, p 0.65), quetiapine ($14,076, p 0.32) and aripiprazole ($13,286, p 0.75). Psychiatric-related costs accounted for roughly half of total costs and were comparable across cohorts. Comorbidities and concomitant medication were significantly associated with increased costs. Nevertheless, unadjusted results were similar to multivariable findings. CONCLUSIONS: In the 12 months following AP initiation total medical care and psychiatric-related costs for schizophrenia patients on ziprasidone were comparable to those for patients on other APs. If cost is a factor in AP treatment choice, the findings suggest ziprasidone compares favorably. PMH33 ECONOMIC IMPLICATION OF DOSE ESCALATION IN DEPRESSED PATIENTS TREATED WITH ESCITALOPRAM OR VENLAFAXINE XR Yu AP1, Bensimon AG1, Wu EQ1, Ben-Hamadi R1, Bourezak A1, Erder MH2 1 Analysis Group, Inc., Boston, MA, USA, 2Forest Research Institute, Jersey City, NJ, USA OBJECTIVES: Dose escalation of antidepressant therapy is a common but potentially costly strategy of managing treatment-refractory depression. This study assessed the cost implications of dose escalation for major depressive disorder (MDD) patients treated with escitalopram versus venlafaxine extended-release (XR). METHODS: MDD patients (age q18) who started escitalopram or venlafaxine XR were identified in the Ingenix Impact Database (2003–2006). The index date was the date when patients first received either drug at the label-recommended initial dose (escitalopram: 10 mg/day; venlafaxine XR: 75 mg/day) or high dose (escitalopram: 20 mg/day; venlafaxine XR: 150 mg/day). Dose escalation was defined as having a refill with daily dose at least double the starting dose during the 6-month post-index period. A generalized linear model (GLM) assessed the effects of dose escalation and starting dose (recommended vs. high) on total health care costs during the post-index period, adjusting for index drug, demographics, comorbidities, and health care utilization at baseline. A similar GLM compared total costs between treatment groups, incorporating the effects of dose escalation and starting dose. RESULTS: 17,638 patients started on escitalopram (18.6% on high-dose) and 9,252 on venlafaxine XR (46.0% on high-dose). Baseline mental comorbidities were similar between treatment groups. Venlafaxine XR patients had a 28.5% and 102.0% higher risk of dose escalation compared to escitalopram patients in the recommended-dose and high-dose subgroups, respectively (both P 0.0001). Dose escalation and high starting dose were associated with $1498 and $688 higher total costs, respectively (both P 0.0001). With lower starting dose and dose escalation risk, escitalopram patients incurred $198 lower regression-adjusted total costs (P 0.0007) than venlafaxine XR patients. CONCLUSIONS: Dose escalation and high initial dose are associated with significantly higher total costs for adult MDD patients. Compared to venlafaxine XR patients, escitalopram patients are less likely to dose escalate or start on high-dose treatment, and incur lower total costs. PMH34 TREATMENT BURDEN AND COSTS OF LISDEXAMFETAMINE DIMESYLATE USERS COMPARED WITH USERS OF OTHER LONGACTING TREATMENTS IN PATIENTS WITH ATTENTION-DEFICIT HYPERACTIVITY DISORDER Christensen L1, Sasane R2, Hodgkins P2, Harley C3 1 i3 Innovus, Ann Arbor, MI, USA, 2Shire Pharmaceuticals, Wayne, PA, USA, 3i3 Innovus, Eden Prairie, MN, USA OBJECTIVES: Lisdexamfetamine dimesylate (LDX), a therapeutically inactive molecule, which after ingestion, is converted to l-lysine, and therapeutically active damphetamine, is the first recently approved long-acting (LA) prodrug stimulant indicated for the treatment of attention-deficit hyperactivity disorder (ADHD) in children and adults. This study examined adult patients in a US commercial health
Abstracts lowing treatment initiation for BPD, total medical care costs for patients on ziprasidone were comparable to those for patients on olanzapine or risperidone, and, significantly lower than costs for patients on quetiapine or aripiprazole. If cost is a factor in AP treatment choice, the findings suggest ziprasidone compares favorably. PMH32 ANTIPSYCHOTIC TREATMENT CHOICE AND ASSOCIATED COSTS OF MEDICAL CARE IN PATIENTS WITH SCHIZOPHRENIA Sanders KN1, Mychaskiw MA1, Alvir J1, Lenhart G2, Palmer L3, O’Gorman C1 1 Pfizer, New York, NY, USA, 2Thomson Medstat, Cambridge, MA, USA, 3Thomson Reuters, Ann Arbor, MI, USA OBJECTIVES: Efficacy in treating schizophrenia has been demonstrated for a variety of atypical antipsychotics (APs). Clinicians will select an appropriate AP based on a variety of clinical considerations but cost of patient care is increasingly becoming a consideration. This study explored the association between AP treatment choice and subsequent medical care costs. METHODS: Patients with schizophrenia and AP treatment were identified in the 2004–2005 PharMetrics Patient-Centric Database. Patients were stratified by the most-recently prescribed AP and retained with q12 months continuous enrollment before and after their earliest AP claim. Total and psychiatricrelated medical care costs were tallied from all paid claims for 12 months post AP initiation. Multivariable analyses controlled for differences between cohorts. RESULTS: Patient cohorts were ziprasidone (n 207), olanzapine (n 755), risperidone (n 1004), quetiapine (n 404) and aripiprazole (n 367). Mean age was 40–44 years. Mood disorders, anxiety, alcohol abuse and substance abuse were prevalent among the sample. Most patients had concomitant medication use. After controlling for covariates, the ziprasidone group’s 12-month post-initiation total costs ($12,920) were similar to risperidone ($11,522, p 0.14), olanzapine ($13,398, p 0.65), quetiapine ($14,076, p 0.32) and aripiprazole ($13,286, p 0.75). Psychiatric-related costs accounted for roughly half of total costs and were comparable across cohorts. Comorbidities and concomitant medication were significantly associated with increased costs. Nevertheless, unadjusted results were similar to multivariable findings. CONCLUSIONS: In the 12 months following AP initiation total medical care and psychiatric-related costs for schizophrenia patients on ziprasidone were comparable to those for patients on other APs. If cost is a factor in AP treatment choice, the findings suggest ziprasidone compares favorably. PMH33 ECONOMIC IMPLICATION OF DOSE ESCALATION IN DEPRESSED PATIENTS TREATED WITH ESCITALOPRAM OR VENLAFAXINE XR Yu AP1, Bensimon AG1, Wu EQ1, Ben-Hamadi R1, Bourezak A1, Erder MH2 1 Analysis Group, Inc., Boston, MA, USA, 2Forest Research Institute, Jersey City, NJ, USA OBJECTIVES: Dose escalation of antidepressant therapy is a common but potentially costly strategy of managing treatment-refractory depression. This study assessed the cost implications of dose escalation for major depressive disorder (MDD) patients treated with escitalopram versus venlafaxine extended-release (XR). METHODS: MDD patients (age q18) who started escitalopram or venlafaxine XR were identified in the Ingenix Impact Database (2003–2006). The index date was the date when patients first received either drug at the label-recommended initial dose (escitalopram: 10 mg/day; venlafaxine XR: 75 mg/day) or high dose (escitalopram: 20 mg/day; venlafaxine XR: 150 mg/day). Dose escalation was defined as having a refill with daily dose at least double the starting dose during the 6-month post-index period. A generalized linear model (GLM) assessed the effects of dose escalation and starting dose (recommended vs. high) on total health care costs during the post-index period, adjusting for index drug, demographics, comorbidities, and health care utilization at baseline. A similar GLM compared total costs between treatment groups, incorporating the effects of dose escalation and starting dose. RESULTS: 17,638 patients started on escitalopram (18.6% on high-dose) and 9,252 on venlafaxine XR (46.0% on high-dose). Baseline mental comorbidities were similar between treatment groups. Venlafaxine XR patients had a 28.5% and 102.0% higher risk of dose escalation compared to escitalopram patients in the recommended-dose and high-dose subgroups, respectively (both P 0.0001). Dose escalation and high starting dose were associated with $1498 and $688 higher total costs, respectively (both P 0.0001). With lower starting dose and dose escalation risk, escitalopram patients incurred $198 lower regression-adjusted total costs (P 0.0007) than venlafaxine XR patients. CONCLUSIONS: Dose escalation and high initial dose are associated with significantly higher total costs for adult MDD patients. Compared to venlafaxine XR patients, escitalopram patients are less likely to dose escalate or start on high-dose treatment, and incur lower total costs. PMH34 TREATMENT BURDEN AND COSTS OF LISDEXAMFETAMINE DIMESYLATE USERS COMPARED WITH USERS OF OTHER LONGACTING TREATMENTS IN PATIENTS WITH ATTENTION-DEFICIT HYPERACTIVITY DISORDER Christensen L1, Sasane R2, Hodgkins P2, Harley C3 1 i3 Innovus, Ann Arbor, MI, USA, 2Shire Pharmaceuticals, Wayne, PA, USA, 3i3 Innovus, Eden Prairie, MN, USA OBJECTIVES: Lisdexamfetamine dimesylate (LDX), a therapeutically inactive molecule, which after ingestion, is converted to l-lysine, and therapeutically active damphetamine, is the first recently approved long-acting (LA) prodrug stimulant indicated for the treatment of attention-deficit hyperactivity disorder (ADHD) in children and adults. This study examined adult patients in a US commercial health